Double tube



FIG. 1 is a perspective view of our design for a double tube;

FIG. 2 is a front elevational view of the double tube shown in FIG. 1;

FIG. 3 is a rear elevational view of the double tube shown in FIG. 1;

FIG. 4 is a side view of the double tube shown in FIG. 1, the oppositeside view being identical;

FIG. 5 is a top end view of the double tube shown in FIG. 1;

FIG. 6 is a bottom end view of the double tube shown in FIG. 1;

FIG. 7 is a perspective view of another embodiment of our design for adouble tube;

FIG. 8 is a front elevational view of the double tube shown in FIG. 7;

FIG. 9 is a rear elevational view of the double tube shown in FIG. 7;

FIG. 10 is a side view of the double tube shown in FIG. 7, the oppositeside view being identical;

FIG. 11 is a top end view of the double tube shown in FIG. 7; and,

FIG. 12 is a bottom end view of the double tube shown in FIG. 7.

The ornamental design for a double tube, as shown and described.